Molecular Basis of Inheritance
CBSE · Class 12 · Biology
Summary of Molecular Basis of Inheritance for CBSE Class 12 Biology. Key concepts, important points, and chapter overview.
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Nucleic acids carry genetic information in living systems. DNA acts as the genetic material in most organisms, while RNA acts as the genetic material in some viruses and also functions as messenger, adapter, structural, and catalytic molecule. The chapter explains the structure of DNA, how genetic m
Key Concepts
DNA is a long polymer
DNA is a long polymer of deoxyribonucleotides. It has two antiparallel strands with sugar-phosphate backbones on the outside and complementary bases o
RNA contains ribose sugar with
RNA contains ribose sugar with an extra 2' OH group and uses Uracil instead of Thymine. It functions as genetic material in some viruses and also as m
DNA was identified as an acidic
DNA was identified as an acidic nuclear substance and later proved to be the hereditary material through transformation experiments and bacteriophage
RNA was the first genetic material
RNA was the first genetic material. Early life processes such as metabolism, translation, and splicing evolved around RNA. RNA could act both as genet
During replication
During replication, each parental DNA strand serves as a template for a new complementary strand. Each daughter DNA molecule contains one old strand a
Learning Objectives
- Understand the structure and properties of DNA and RNA
- Explain how DNA was established as the genetic material
- Describe the RNA world hypothesis and its significance
- Explain semiconservative DNA replication and its experimental proof
- Describe transcription in prokaryotes and eukaryotes
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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